Drill tightening and loosening jack



8. LA POINT.

DRILL TIGHTENING AND LOOSENING JACK.

Patented Nov. 9, 1920.

" INVENTOI? Sieve La Pomt.

BY %po ATTORNEYS UNITED STATES PQTENT OFFICE.

STEVE LA POINT, OF TULSA, OKLAHOMA, ASSIGNOE T ULYSSES D. FORTIER AND J OE BURKE, BOTH 0F TULSA, OKLAHOMA.

DRILL TIGHTENING AND LOOSENING- JACK.

Specification of Letters Patent.

Patented Nov. 9, 1920.

Application filed January 21, 1920. Serial No. 352,968.

To all whom it may concern:

Beit known that I, STEVE LA POINT, a citizen of the United States, and a resident of Tulsa, in the county of Tulsa and State of Oklahoma, have invented certain new and useful Improvements in Drill Tightening and Loosening Jacks, of which the following is a specification.

My present invention relates generally to jacks, and particularly to power jacks, my primary object being the provision of a quick adjusting double acting arrangement, more especially an arrangement of this sort which is simple in construction and positive and eiiicient in its action. 7

In the accompanying drawing which illustrates my present invention and forms a part of this specification,

Figure 1 is a side elevation,

Fig. 2 is a rear elevation, and

Fig. 3 is a vertical longitudinal section.

Referring now to these fi ures, the body of my improved jack, moves upon a track 11, the latter of which has a rack surface 12 and is provided with lower cross pieces 13 by means of which it may be secured to a suitable surface.

The body 10 of the jack is formed of a pair of side plates indicated at 14 and 15, rigidly connected in spaced apart relation by forward and rear spacing blocks 16, below the lower end of the latter of which the lower edges of the side walls extend and have inturned flanges 17 slidably engaging the lower surface of the track 11. Through the spacing blocks 16 connecting bolts 18 are extended and in the space between the lower portions of these spacing blocks, a fulcrum pin 19 extends through the side walls and through the lower portion of a lever 20 having an upper bifurcated portion 21 within the slot of which is a roller mounted pin 22 at the lower inner end of the operatinglever 23. This lever is fulcrumed upon a transverse pin 24 connecting the upper portions of the side walls 1% and of the body, and is movable back and forth in order to shift lever upon the fulcrum 19 of the latter.

Lever 20 actuates a pair of pawls 25 and 26, each of which is disposed to engage the upper rack surface 12 of the track 11 in the same direction, and each of which is rigidly secured to side plates straddling portions of the lever 20 above and below its fulcrum 19. Pawl 25 is pivotedat 27 to the lever 2Q below the fulcrum 19, and pawl 26 is pivoted at 28 to the lever 20 aboveits fulcrum.

In this way it is obvious as the lever 20 is shifted in one direction by action of the operating lever pawl 25 is forced lengthwise into engagement with the rack as the other. pawl 26 is moved away from the rack, and as the lever is shifted in the opposite direction pawl 26 is forced lengthwise into en gagement with the rack as the pawl 25 is lifted, so that when the operating lever is moved in either direction the body 10 is shifted along the rack.

My invention is thus particularly adapted tothe tightening and loosening of drilling tools in oil well operations and results in quick action and positive operation with an arrangement which is at the same time simple, cheap and effective.

It will be noted that in addition to their function in holding the side plates 14 and 15 of the body 10 in properly spaced relation, the spacing blocks 16 serve as abutments to limit swinging movement of the lever 20 so that the operating lever 23 cannot in turn be moved to such an extent as to shift its roller mounted pin 22 out of the slot of the lever 20.

I claim:

A jack for the purpose described comprising a stationary rack, a body movable on the rack and including spaced side plates having flanged edges partially embracing the rack, a pawl carrying lever fulcrumed between the side plates and having an upper forked end, a pair of pawls extending in the same direction into engagement with the rack and pivoted to the pawl carrying lever at relatively opposite sides of its fulcrum, and an operating lever fulcrumed between the side plates and having a lower bifurcated end receiving the said upper end of the pawl carrying lever and a roller mounted pin disposed across its bifurcation and extending between the forks of the pawl carrying lever, said movable body including spacing blocks between its said s1de plates forming limiting abutments agalnst which the said pawl carrying lever is engageable.

his STEVE LA POINT.

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